78935993 has 2 divisors, whose sum is σ = 78935994. Its totient is φ = 78935992.

The previous prime is 78935971. The next prime is 78936001. The reversal of 78935993 is 39953987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55771024 + 23164969 = 7468^2 + 4813^2 .

It is an emirp because it is prime and its reverse (39953987) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78935993 is a prime.

It is not a weakly prime, because it can be changed into another prime (78935903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39467996 + 39467997.

It is an arithmetic number, because the mean of its divisors is an integer number (39467997).

Almost surely, 2^78935993 is an apocalyptic number.

It is an amenable number.

78935993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78935993 is an equidigital number, since it uses as much as digits as its factorization.

78935993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 53.

The square root of 78935993 is about 8884.5930126258. The cubic root of 78935993 is about 428.9681279220.

The spelling of 78935993 in words is "seventy-eight million, nine hundred thirty-five thousand, nine hundred ninety-three".